20711000

素因数分解:

$2^3\times 5^3\times {\mathrm{139}}^1\times {\mathrm{149}}^1$

素因数の和:309

約数の個数: 64

約数和(自身を含む): 49140000

約数和(自身を除く): 28429000

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 125, 139, 149, 200, 250, 278, 298, 500, 556, 596, 695, 745, 1000, 1112, 1192, 1390, 1490, 2780, 2980, 3475, 3725, 5560, 5960, 6950, 7450, 13900, 14900, 17375, 18625, 20711, 27800, 29800, 34750, 37250, 41422, 69500, 74500, 82844, 103555, 139000, 149000, 165688, 207110, 414220, 517775, 828440, 1035550, 2071100, 2588875, 4142200, 5177750, 10355500, 20711000]

約数ペア:

[(1, 20711000), (2, 10355500), (4, 5177750), (5, 4142200), (8, 2588875), (10, 2071100), (20, 1035550), (25, 828440), (40, 517775), (50, 414220), (100, 207110), (125, 165688), (139, 149000), (149, 139000), (200, 103555), (250, 82844), (278, 74500), (298, 69500), (500, 41422), (556, 37250), (596, 34750), (695, 29800), (745, 27800), (1000, 20711), (1112, 18625), (1192, 17375), (1390, 14900), (1490, 13900), (2780, 7450), (2980, 6950), (3475, 5960), (3725, 5560)]